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(Beginner) Ethernet interface



Jan 1, 1970
I have a module that requires an Ethernet interface.

Do i only need a PHY transceiver such as the KENDIN KS8721B PHY
transceiver and a RJ45 jack?

There's this thing called a single port (surface mount) magnetics. It's
gotta do with line isolation? Do i need it or is it optional?


Jan 1, 1970
Ethernet communications are typically modeled as consisting of several
layers. Towards the bottom of the layers is the PHY interface. While
I haven't looked up the device that you referenced, the PHY chip will
be responsible for handling the low level signal receive and transmit
in addition to things such as ascertaining what speed of network it is
connected to. On top of this is a layer that is responsible for
breaking the messages into packets (and receiving the packets)
generating and decoding the checksums, etc. This functionality may be
implemented in this hardware or it may be delegated to a higher level
control. On top of this, you have protocol systems for the connections
andfor the application data transfer. The devices that you need will
depend on what level of functionaily you are tyring to implement. It
is a pretty safe bet, however, that you will need a lot more than a PHY
chip and a port jack.

Regarding the magnetics. a transformer will block any DC signals,
providing a DC isolation between the controller and the network. This
is necessary because of a lack of reference potential between the
networked elements. The transformer will still pass the AC or changing
signals which compose the communications.